20263563 has 6 divisors (see below), whose sum is σ = 29269604. Its totient is φ = 13509036.

The previous prime is 20263561. The next prime is 20263567. The reversal of 20263563 is 36536202.

20263563 is a `hidden beast` number, since 20 + 2 + 635 + 6 + 3 = 666.

It is not a de Polignac number, because 20263563 - 2¹ = 20263561 is a prime.

It is a super-2 number, since 2×20263563² = 821223970909938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20263561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125745 + ... + 1125762.

Almost surely, 2^20263563 is an apocalyptic number.

20263563 is a deficient number, since it is larger than the sum of its proper divisors (9006041).

20263563 is a wasteful number, since it uses less digits than its factorization.

20263563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251513 (or 2251510 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 20263563 is about 4501.5067477457. The cubic root of 20263563 is about 272.6289286934.

Adding to 20263563 its reverse (36536202), we get a palindrome (56799765).

The spelling of 20263563 in words is "twenty million, two hundred sixty-three thousand, five hundred sixty-three".